Switching between standard and enriched air

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Hi Zaphod,
I think we're in agreement on the analyze-your-own-mix issue, as I did mention "analyzing the total mix"...secondly I included * ' * around the word "new" to emphasize that the regulation wasn't new, just new to the discussion at hand.

If the CGA and DOT don't care which concentration of EAN I'm using, they just want to know that it's EAN, fine, divers can keep doing what they've been doing for years, namely marking their tanks with the EAN concentration and MOD....still don't see where a re-hydro fits into the picture here.

Kinda interesting though, if it turned out they made the regulations 'stick' in the real world......forcing everyone to buy masses of tanks, and do constant rehydroing....the hassle factor/expense of all that, on top of the already higher prices for Nitrox fills to begin with, killed off the Nitrox market...thus reducing the very same diver safety issue that they claim is their sole motivation.

Karl
 
The CGA recommendation is that the cylinder be re-qualified (re-hydro) whenever the contents are changed (i.e. from Air to EAN, or presumably EAN to Air). As long as the cylinder always contains some mix of EAN, you're fine - but since Air is not EAN, by definition, then switching back to air requires a re-hydro (regardless of the quality of the air). They're not my rules...but they may soon become law.

scubafanatic:
Hi Zaphod,
I think we're in agreement on the analyze-your-own-mix issue, as I did mention "analyzing the total mix"...secondly I included * ' * around the word "new" to emphasize that the regulation wasn't new, just new to the discussion at hand.

If the CGA and DOT don't care which concentration of EAN I'm using, they just want to know that it's EAN, fine, divers can keep doing what they've been doing for years, namely marking their tanks with the EAN concentration and MOD....still don't see where a re-hydro fits into the picture here.

Kinda interesting though, if it turned out they made the regulations 'stick' in the real world......forcing everyone to buy masses of tanks, and do constant rehydroing....the hassle factor/expense of all that, on top of the already higher prices for Nitrox fills to begin with, killed off the Nitrox market...thus reducing the very same diver safety issue that they claim is their sole motivation.

Karl
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